When selecting a pillow insert for a 20-inch cover, you’ll want an insert that is typically 2 inches larger to ensure a plump and full appearance for your pillow. Therefore, a 22-inch pillow insert is ideal for a 20-inch pillow cover.
Understanding Pillow Sizing
The general rule of thumb for a lush, full pillow is to choose an insert that is 2 inches larger than the cover. This rule applies to both square and rectangular pillow covers. For instance, if you have a 20 x 20-inch pillow cover, an insert that is 22 x 22 inches will fill out the corners nicely, giving you a firm and plush pillow that feels as good as it looks. Similarly, for a 20 x 26-inch (standard size) pillow cover, going for a 22 x 28-inch insert would be advisable.
Selecting the Right Insert
Fill Material Options
Pillow inserts come in a variety of fill materials—each offering different comfort levels and appearance:
- Down and Feather: These inserts are known for their softness and ability to hold their shape. They are comfortable, luxurious, and tend to be more expensive. If opting for down and feather, make sure the cover is tightly woven to prevent feathers from poking through.
- Down Alternative: Typically made from synthetic materials like polyester fibers, down alternative inserts are hypoallergenic, less expensive than natural down, and easier to care for. They can also effectively mimic the feel of real down.
- Foam: Foam inserts are firmer and hold their shape, which can be advantageous if the pillow is more decorative or will be used for support.
- Memory Foam: They contour to the body, offering support where needed. Memory foam inserts can be a good choice for those looking for extra neck or back support.
- Buckwheat Hulls: These offer a firm and breathable option, conforming well to the shape of the head and neck.
- Cotton: Cotton-filled inserts are firmer than down but softer than foam, offering a good balance of support and comfort.
- Wool: Wool pillows are hypoallergenic, naturally resistant to dust mites, and regulate temperature well, staying cool in summer and warm in winter.
Cover Material and Pillow Insert Compatibility
The compatibility between the pillow cover material and the insert is vital for achieving the desired look and feel. A sturdy cotton or linen cover can handle a firmer insert, while a delicate silk cover might require a softer down or down-alternative insert to prevent the material from stretching or bulging awkwardly.
Our Top 5 Pillow Picks
Updated September 2026MFWW Cervical Contour Memory Foam Pillow
Best for neck pain. A dual-height ergonomic contour cradles your head and supports the neck, for back and side sleepers.
- Contour memory foam
- Dual-height design
- Cool breathable cover
Cooling Shredded Memory Foam Pillows, Standard, 2-Pack
Best value pair. Shredded foam you can adjust to your loft, with a cool-gel feel and no solid-block heat. Two pillows in one box.
- Adjustable shredded foam
- Cool gel
- Hypoallergenic
- Standard 2-pack
Cooling Shredded Memory Foam Pillows, Queen, Set of 4
Best for the whole household. The same adjustable cooling foam in queen size, four to a set, so every bed in the house gets an upgrade.
- Adjustable shredded foam
- Cool gel
- Hypoallergenic
- Queen set of 4
Utopia Bedding Hotel Pillows, Queen, Set of 4
Best hotel-style set. Plush, cooling pillows made to suit side, back and stomach sleepers alike. A safe pick for guest rooms.
- Queen set of 4
- Cooling
- All sleep positions
- Hotel style
Zalmureta Goose Feather & Down Pillows, Queen, Set of 2
Best luxury pick. A three-chamber goose feather and down fill wrapped in a 100% cotton shell, for that five-star-hotel feel at home.
- Goose feather & down
- 3-chamber design
- 100% cotton shell
- Queen 2-pack
Measuring Correctly
When measuring for a pillow insert, always measure the pillow cover from one inside seam to the other inside seam. Don’t measure the pillow cover from edge to edge. This internal seam-to-seam measurement ensures that you account for the actual space the insert needs to fill.
Adjusting for Different Types of Pillows
Different types of pillows may require different sizing considerations. For example, bolster pillows or lumbar pillows may not need to be as plump as a classic square decorative pillow, so in these cases, you may opt for an insert that is closer to the actual size of the cover or just an inch larger.
Care and Maintenance of Pillow Inserts
Proper care prolongs the life of your pillows, regardless of the type of insert you choose. Generally, down and feather inserts should be fluffed regularly to maintain their loft, while synthetic fills can be laundered more frequently and are less prone to clumping. Always look at the care label before washing or drying your inserts, as some materials may require specific care.
Considerations for Sustainability and Allergies
For those with allergies or sensitivities, hypoallergenic pillow inserts such as down alternative or specialty hypoallergenic down fills can provide comfort without triggering allergic reactions. Additionally, consumers focused on sustainability might look for inserts made with organic or responsibly sourced materials.
When to Choose a Different Size
There are exceptions to every rule, and in some cases, you may want to choose an insert that is the same size as your pillow cover—such as when you’re looking for a particularly flat look or when the cover is extraordinarily stretchy or oversized. Always consider the intended use and personal preference when making your final decision.
Finishing Thoughts
Choosing the correct size pillow insert for your cover is crucial for achieving the look and feel you desire. For a 20-inch pillow cover, a 22-inch pillow insert will usually provide that perfect balance of fullness and comfort. However, consider the material of both the pillow cover and the insert, as well as personal preferences and needs, when making your selection. Caring for your pillows properly will ensure they last longer and remain as comfortable and supportive as when they were new. Remember these guidelines, and you’ll have pillows that are not only cozy and inviting but also beautifully accentuate your living space.
